TPU ishingiye kuri polyether

TPU ishingiye kuri polyetherni ubwoko bwaelastomeri ya polyurethane ya thermoplasticIntangiriro yayo mu Cyongereza ni iyi ikurikira:

### Imiterere n'Ikorwa TPU ishingiye kuri polyether ikorwa ahanini iva muri 4,4′-diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), na 1,4-butanediol (BDO). Muri byo, MDI itanga imiterere ikomeye, PTMEG igize igice cyoroshye kugira ngo ihe ibikoresho ubushobozi bwo koroha, naho BDO ikora nk'umuyoboro wongera uburebure bw'umuyoboro wa molekile. Uburyo bwo gukora ni uko MDI na PTMEG babanza gukora prepolymer, hanyuma prepolymer igakora reaction yo kongera umuyoboro hamwe na BDO, hanyuma, TPU ishingiye kuri polyether ikorwa hakoreshejwe catalyst.

### Imiterere y'imiterere Uruhererekane rwa molekile rwa TPU rufite imiterere y'umurongo wa (AB)n-type block linear, aho A ari igice cyoroshye cya polyether gifite uburemere buhanitse bwa molekile gifite uburemere bwa molekile 1000-6000, B muri rusange ni butanediol, kandi imiterere ya chimique iri hagati y'iminyururu ya AB ni diisocyanate.

### Ibyiza by'Imikorere -

**Ubudahangarwa bwiza bwa Hydrolysis**: Umugozi wa polyether (-O-) ufite ubushobozi bwo kudahinduka cyane mu bya shimi kurusha umugozi wa polyester (-COO-), kandi ntabwo byoroshye gucika no kwangirika mu mazi cyangwa ahantu hashyushye kandi hatose. Urugero, mu igeragezwa ry’igihe kirekire kuri 80°C na 95% by’ubushuhe, igipimo cyo kugumana imbaraga zo gukurura, TPU ishingiye kuri polyether, kirenga 85%, kandi nta kugabanuka kugaragara k’igipimo cyo gusubiranamo kwa elastic. – **Ubushyuhe buke**: Ubushyuhe bw’impinduka mu kirahuri (Tg) cy’igice cya polyether buri hasi (ubusanzwe buri munsi ya -50°C), bivuze koTPU ishingiye kuri polyetheriracyashobora gukomeza kugorama no koroherwa neza mu gihe cy'ubushyuhe buke. Mu isuzuma rya -40°C ku bushyuhe buke, nta kintu na kimwe cyacitse kigaragara, kandi itandukaniro mu mikorere yo kugonda ugereranyije n'ubushyuhe busanzwe riri munsi ya 10%. – **Ubudahangarwa bwiza bwa chimique no kudahangarwa na mikorobe**:TPU ishingiye kuri polyetherIshobora kwihanganira ibintu byinshi biyungurura umwuka (nk'inzoga, ethylene glycol, aside nke na alkali), kandi ntizibyimba cyangwa ngo zishonge. Byongeye kandi, igice cya polyether nticyoroshye kubora na mikorobe (nk'ibihumyo na bagiteri), bityo ishobora kwirinda kunanirwa gukora guterwa no kwangirika kwa mikorobe iyo ikoreshejwe mu butaka butose cyangwa mu mazi. – **Imiterere y'Ubukanishi iringaniye**: Dufashe urugero, ubukana bwayo bwa Shore ni 85A, buri mu cyiciro cya elastomer z'ubukana buri hagati. Ntabwo igumana gusa ubukana n'ubushobozi busanzwe bwa TPU, ahubwo inafite imbaraga zihagije z'imiterere, kandi ishobora kugera ku buringanire hagati ya "elastic recovery" na "shape stability". Ingufu zayo zo gukurura zishobora kugera kuri 28MPa, uburebure mu gihe cyo kuruhuka burenga 500%, kandi imbaraga zo gucika ni 60kN/m.

### Imirimo yo Gukoresha TPU ishingiye kuri Polyether ikoreshwa cyane mu nzego nko mu buvuzi, mu modoka, no hanze. Mu rwego rw'ubuvuzi, ishobora gukoreshwa mu gukora catheters zo kwa muganga bitewe nuko ikora neza mu bijyanye n'ibinyabuzima, irwanya hydrolysis ndetse no kurwanya mikorobe. Mu rwego rw'imodoka, ishobora gukoreshwa mu miyoboro y'ibice bya moteri, imiyoboro y'inzugi, n'ibindi kubera ubushobozi bwayo bwo kwihanganira ubushyuhe bwinshi n'ubukonje, ubushyuhe buke no kurwanya ozone. Mu rwego rw'inyuma, ikwiriye gukora uturemangingo two hanze tudapfa amazi, mu duce duke, n'ibindi.